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Homortomyces gen. nov., a new dothidealean pycnidial fungus from the Cradle of Humankind.

Crous PW, Groenewald JZ, Lombard L, Wingfield MJ - IMA Fungus (2012)

Bottom Line: Based on its transversely septate, brown conidia, the presence of paraphyses, and percurrent proliferation of the conidiogenous cells, the genus resembles Stilbospora (Melanoconidaceae, Diaporthales).It is distinct in having pycnidial condiomata, conidia lacking mucoid sheaths, and becoming muriform when mature.Its morphology and phylogenetic placement based on analyses of sequence data for the large subunit nuclear ribosomal RNA gene (LSU, 28S) as well as the ITS and 5.8S rRNA gene of the nrDNA operon, show that Homortomyces represents a novel genus in Dothideomycetes, although its familial relationships remain unresolved.

View Article: PubMed Central - PubMed

Affiliation: CBS-KNAW Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands;

ABSTRACT
Homortomyces is introduced as a new coelomycetous genus associated with leaf spots onCombretum erythrophyllum trees growing near and around the Sterkfontein caves, Maropeng, South Africa. Based on its transversely septate, brown conidia, the presence of paraphyses, and percurrent proliferation of the conidiogenous cells, the genus resembles Stilbospora (Melanoconidaceae, Diaporthales). It is distinct in having pycnidial condiomata, conidia lacking mucoid sheaths, and becoming muriform when mature. Its morphology and phylogenetic placement based on analyses of sequence data for the large subunit nuclear ribosomal RNA gene (LSU, 28S) as well as the ITS and 5.8S rRNA gene of the nrDNA operon, show that Homortomyces represents a novel genus in Dothideomycetes, although its familial relationships remain unresolved.

No MeSH data available.


Related in: MedlinePlus

Bayesian consensus phylogeny obtained from the analysis of the LSU sequence alignment. The scale bar represents the average number of substitutions per site, and posterior probability values are shown at the nodes. The novel species treated in this study is shown in red and novel sequences in bold. Orders are indicated in the coloured blocks. Branches also present in the strict consensus tree of the parsimony analysis are thickened and the tree was rooted on a sequence of Magnaporthe grisea (GenBank accession no. AB026819).
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Figure 1: Bayesian consensus phylogeny obtained from the analysis of the LSU sequence alignment. The scale bar represents the average number of substitutions per site, and posterior probability values are shown at the nodes. The novel species treated in this study is shown in red and novel sequences in bold. Orders are indicated in the coloured blocks. Branches also present in the strict consensus tree of the parsimony analysis are thickened and the tree was rooted on a sequence of Magnaporthe grisea (GenBank accession no. AB026819).

Mentions: A Bayesian analysis was conducted on the aligned LSU sequences using a general time-reversible (GTR) substitution model with inverse gamma rates and dirichlet base frequencies. The Markov Chain Monte Carlo (MCMC) analyses of two sets of 4 chains started from a random tree topology and lasted 506 000 generations, after which the split frequency reached less than 0.01. Trees were saved each 1 000 generations, resulting in 1 012 saved trees. Burn-in was set at 25 %, leaving 760 trees from which the consensus tree and posterior probabilities (PP’s) were calculated (Fig. 1).


Homortomyces gen. nov., a new dothidealean pycnidial fungus from the Cradle of Humankind.

Crous PW, Groenewald JZ, Lombard L, Wingfield MJ - IMA Fungus (2012)

Bayesian consensus phylogeny obtained from the analysis of the LSU sequence alignment. The scale bar represents the average number of substitutions per site, and posterior probability values are shown at the nodes. The novel species treated in this study is shown in red and novel sequences in bold. Orders are indicated in the coloured blocks. Branches also present in the strict consensus tree of the parsimony analysis are thickened and the tree was rooted on a sequence of Magnaporthe grisea (GenBank accession no. AB026819).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3539313&req=5

Figure 1: Bayesian consensus phylogeny obtained from the analysis of the LSU sequence alignment. The scale bar represents the average number of substitutions per site, and posterior probability values are shown at the nodes. The novel species treated in this study is shown in red and novel sequences in bold. Orders are indicated in the coloured blocks. Branches also present in the strict consensus tree of the parsimony analysis are thickened and the tree was rooted on a sequence of Magnaporthe grisea (GenBank accession no. AB026819).
Mentions: A Bayesian analysis was conducted on the aligned LSU sequences using a general time-reversible (GTR) substitution model with inverse gamma rates and dirichlet base frequencies. The Markov Chain Monte Carlo (MCMC) analyses of two sets of 4 chains started from a random tree topology and lasted 506 000 generations, after which the split frequency reached less than 0.01. Trees were saved each 1 000 generations, resulting in 1 012 saved trees. Burn-in was set at 25 %, leaving 760 trees from which the consensus tree and posterior probabilities (PP’s) were calculated (Fig. 1).

Bottom Line: Based on its transversely septate, brown conidia, the presence of paraphyses, and percurrent proliferation of the conidiogenous cells, the genus resembles Stilbospora (Melanoconidaceae, Diaporthales).It is distinct in having pycnidial condiomata, conidia lacking mucoid sheaths, and becoming muriform when mature.Its morphology and phylogenetic placement based on analyses of sequence data for the large subunit nuclear ribosomal RNA gene (LSU, 28S) as well as the ITS and 5.8S rRNA gene of the nrDNA operon, show that Homortomyces represents a novel genus in Dothideomycetes, although its familial relationships remain unresolved.

View Article: PubMed Central - PubMed

Affiliation: CBS-KNAW Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands;

ABSTRACT
Homortomyces is introduced as a new coelomycetous genus associated with leaf spots onCombretum erythrophyllum trees growing near and around the Sterkfontein caves, Maropeng, South Africa. Based on its transversely septate, brown conidia, the presence of paraphyses, and percurrent proliferation of the conidiogenous cells, the genus resembles Stilbospora (Melanoconidaceae, Diaporthales). It is distinct in having pycnidial condiomata, conidia lacking mucoid sheaths, and becoming muriform when mature. Its morphology and phylogenetic placement based on analyses of sequence data for the large subunit nuclear ribosomal RNA gene (LSU, 28S) as well as the ITS and 5.8S rRNA gene of the nrDNA operon, show that Homortomyces represents a novel genus in Dothideomycetes, although its familial relationships remain unresolved.

No MeSH data available.


Related in: MedlinePlus